Fix <RuntimeError: Event loop is closed> in windows

[Hansimov]

Issue Description

When use ayncio.run() in Windows like this:

self.response = asyncio.run(self.send_to_bing(echo, echo_prompt))

It would raise a RuntimeError: Event loop is closed:

Traceback (most recent call last):
  File "C:\Python39\lib\asyncio\proactor_events.py", line 116, in __del__
    self.close()
  File "C:\Python39\lib\asyncio\proactor_events.py", line 108, in close
    self._loop.call_soon(self._call_connection_lost, None)
  File "C:\Python39\lib\asyncio\base_events.py", line 746, in call_soon
    self._check_closed()
  File "C:\Python39\lib\asyncio\base_events.py", line 510, in _check_closed
    raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed

Solution

import platform
...
if platform.system() == "Windows":
    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())

References

• python - "Asyncio Event Loop is Closed" when getting loop - Stack Overflow
  • https://stackoverflow.com/questions/45600579/asyncio-event-loop-is-closed-when-getting-loop
• Policies — Python 3.11.3 documentation
  • https://docs.python.org/3/library/asyncio-policy.html#asyncio.WindowsSelectorEventLoopPolicy

[acheong08]

I hate Windows